Integrated Crop Management News

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Sudden death syndrome (SDS) generally strikes soybean around the middle of August in Iowa. Because of the unusual weather this growing season, the disease is showing up much earlier and was reported last week from several southern Iowa counties. The fields that we visited last week had several disease patches in poor drainage areas. Plants in these areas showed intervienal necrosis on leaves and root rot symptoms. The lower portion of stems, when they were split, was gray. In some plants, bluish fungal colonies could be seen on the roots, but these colonies were not as common as in plants later in the summer. Phytophthora root and stem rot also was coexisting with SDS in these fields.

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Iowa State University



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